Welcome Kris, Its impossible to be 100% certain from the photographs, but the second picture suggests what I would immediately assume to be true. One side of a 1962 halfcrown has been hollowed out on a lathe and a second coin, also reduced on a lathe, has been let into the first. The join is just visible in places along the rim. I have a couple examples of this and I suspect many collectors do. They have no value except as a curiosity. Good for 'heads or tails' though For this to be genuine, it would require the mint to have used two reverse dies at the same time, which just doesn't happen. Accumulator is absolutely right regarding how they were made; the lathe operator in question must have been flush at the time though, as it was more common to do it with a penny. Probably the best thing you can do is put it on e-bay and see if there are any takers. Don't say it's genuine though!